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Combining two main NAL1 functional alleles can increase rice yield.

Xiang Ouyang1, Shuoqi Chang1, Xiaoling Ma2

  • 1State Key Laboratory of Hybrid Rice, Hunan Hybrid Rice Research Center, Hunan Academy of Agricultural Sciences, Changsha, China.

Frontiers in Plant Science
|December 17, 2024
PubMed
Summary

Combining different alleles of the NARROW LEAF1 (NAL1) gene in rice hybrids significantly boosts grain yield and improves plant architecture. This strategy leverages NAL1 heterosis for enhanced crop production.

Keywords:
NARROW LEAF1effective utilizationfunctional allelesgrain yieldhybrid vigorrice

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Area of Science:

  • Plant Genetics and Breeding
  • Agricultural Science
  • Molecular Biology

Background:

  • NARROW LEAF1 (NAL1) is crucial for regulating photosynthesis and plant architecture in rice.
  • The complex effects of NAL1 on photosynthesis and yield components present challenges for optimizing rice production.
  • Understanding how to best utilize NAL1 alleles for yield improvement is essential.

Purpose of the Study:

  • To investigate the yield potential of combined NAL1 alleles compared to homozygous NAL1 alleles in rice.
  • To assess the effects of NAL1 allele combinations on yield components, plant architecture, and photosynthesis.
  • To confirm the hybrid vigor of NAL1 in established super hybrid rice varieties.

Main Methods:

  • Utilized two distinct functional NAL1 alleles to create combined and homozygous lines.
  • Evaluated heterosis (BPH and MPH) for yield traits including panicle number, grain number, and thousand-grain weight.
  • Conducted Western blot and proteomics analyses to examine NAL1 protein levels and associated molecular pathways.
  • Tested NAL1 hybrid vigor by substituting male parents in super hybrid rice varieties LYP9 and YLY1.

Main Results:

  • Combined NAL1 alleles exhibited superior parent heterosis (BPH) for panicle number and total filled grain number per plant.
  • Middle parent heterosis (MPH) was observed for spikelet number per panicle, with no negative impact on thousand-grain weight.
  • NAL1 hybrid plants showed significantly increased grain yield, improved plant architecture, and enhanced canopy photosynthesis compared to homozygous parents.
  • Proteomic analysis revealed altered protein levels involved in nuclear processes, DNA binding, and metabolic pathways.

Conclusions:

  • Combining functional NAL1 alleles is an effective strategy to enhance grain yield in hybrid rice through heterosis.
  • The NAL1 gene's hybrid vigor contributes to improved plant architecture and photosynthetic efficiency.
  • This study provides a foundation for utilizing NAL1 allele combinations to achieve higher rice production levels.